Poly Axial Spondylolisthesis Reduction Screw (5.5 MM)

The Poly Axial Spondylolisthesis Reduction Screw (5.5 mm) is a titanium spinal fixation implant designed for integration within compatible posterior spinal instrumentation and reduction systems according to the manufacturer’s approved indications and surgical technique.

The implant combines an elongated threaded bone-engagement shaft with a proximal polyaxial reduction-style fixation head. The polyaxial configuration allows controlled orientation of the head relative to the screw shaft within the mechanical limits of the fixation system, while the extended reduction-style head geometry is designed to facilitate engagement, alignment, and positioning of compatible spinal rods during reduction and construct assembly.

According to the supplied catalog:

Material: Titanium
General Cat. No.: AMS 520.055.000
Nominal Diameter: 5.5 mm

The product is available in 12 length configurations from 25 mm to 80 mm, providing a broad implant selection range according to vertebral anatomy, bone dimensions, fixation depth, screw trajectory, rod position, reduction requirements, and overall construct geometry.

Each configuration carries an individual Cat. No. and GTIN No., supporting accurate implant identification, product traceability, surgical set preparation, procurement, inventory management, and stock control.

Product Explanation

The Poly Axial Spondylolisthesis Reduction Screw (5.5 mm) is a posterior spinal fixation screw designed to function within a compatible reduction and rod-based stabilization construct.

A simplified construct can be represented as:

Vertebra → Polyaxial Reduction Screw → Compatible Spinal Rod → Locking Component → Posterior Spinal Fixation Construct

The threaded shaft provides mechanical engagement with vertebral bone, while the polyaxial reduction head serves as the connection interface for compatible rods and locking elements.

The exact reduction technique and locking sequence must follow the manufacturer’s approved Surgical Technique and IFU.

Product Components and Design

1. Titanium Screw Body

The principal implant structure is manufactured from Titanium, according to the supplied product data.

2. 5.5 MM Nominal Diameter

The catalog identifies the product as:

Poly Axial Spondylolisthesis Reduction Screw (5.5 mm)

indicating a nominal screw diameter of 5.5 mm.

3. Threaded Bone-Engagement Shaft

The screw incorporates an elongated threaded shaft designed for mechanical engagement within vertebral bone.

The supplied data does not specify:

• Thread pitch
• Thread depth
• Core diameter
• Thread profile
• Self-tapping characteristics

4. Polyaxial Fixation Head

The proximal fixation head is designed to permit controlled orientation relative to the screw shaft within the limits of the compatible spinal system.

This configuration helps accommodate rod positioning during construct assembly.

5. Reduction-Style Extended Head

The product is specifically classified as a Spondylolisthesis Reduction Screw, and its proximal section incorporates an extended head configuration intended for compatible reduction constructs.

The supplied catalog does not define:

• Reduction travel
• Reduction range
• Extension-tab removal mechanism
• Maximum permissible reduction force
• Final locking sequence

6. Distal Tip

The distal tip forms part of the threaded bone-engagement geometry.

7. Length Configurations

Available lengths are:

25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 / 70 / 75 / 80 mm

Intended Use

The Poly Axial Spondylolisthesis Reduction Screw (5.5 mm) is intended for use within compatible posterior spinal fixation and reduction systems according to the manufacturer’s approved indications and Instructions for Use.

Potential applications, where included within the approved indications, may include:

• Posterior spinal stabilization.
• Screw-and-rod fixation constructs.
• Reduction-type posterior spinal constructs.
• Spondylolisthesis-related stabilization procedures where specifically approved.
• Multi-level spinal instrumentation.
• Spinal reconstruction procedures.
• Spinal deformity fixation constructs.
• Compatible thoracic or lumbar posterior spinal systems.

Selection of the appropriate screw configuration depends on:

• Vertebral anatomy.
• Bone dimensions.
• Bone quality.
• Required fixation depth.
• Screw trajectory.
• Rod positioning.
• Reduction requirements.
• Construct geometry.
• Preoperative planning.
• Intraoperative assessment.

The implant should be selected and inserted by a qualified spine surgeon according to the approved surgical technique and IFU.

Key Benefits

Titanium Material

The supplied catalog specifies:

Material: Titanium

5.5 MM Reduction Screw Configuration

The implant is specifically identified as a:

Poly Axial Spondylolisthesis Reduction Screw (5.5 mm)

for compatible posterior spinal fixation constructs.

Polyaxial Head Design

The polyaxial head allows controlled orientation relative to the screw shaft within compatible system limits.

Reduction-Style Head Geometry

The extended proximal configuration is designed for integration into compatible spinal reduction constructs.

Wide Length Range

Available lengths extend from:

25 mm to 80 mm

Twelve Product Configurations

The family includes:

12 individual screw lengths

Regular 5 MM Progression

The available lengths progress in:

5 mm increments

throughout the range.

Threaded Bone-Engagement Design

The implant incorporates an elongated threaded shaft for mechanical vertebral bone engagement.

Product Traceability

Each configuration has an individual Cat. No. and GTIN No. to support:

• Implant identification
• Product traceability
• Surgical set preparation
• Procurement
• Inventory management
• Stock control

Technical Specifications

Length	Cat. No.	GTIN No.
25 mm	AMS 520.055.025T	6221361021075
30 mm	AMS 520.055.030T	6221361021105
35 mm	AMS 520.055.035T	6221361021136
40 mm	AMS 520.055.040T	6221361021167
45 mm	AMS 520.055.045T	6221361021198
50 mm	AMS 520.055.050T	6221361021228
55 mm	AMS 520.055.055T	6221361021259
60 mm	AMS 520.055.060T	6221361021280
65 mm	AMS 520.055.065T	6221361021310
70 mm	AMS 520.055.070T	6221361021341
75 mm	AMS 520.055.075T	6221361021372
80 mm	AMS 520.055.080T	6221361021402

Technical Overview

Product Name: Poly Axial Spondylolisthesis Reduction Screw (5.5 mm)
Material: Titanium
Product Type: Polyaxial Reduction Spinal Fixation Screw
Product Category: Posterior Spinal Internal Fixation Implant
General Cat. No.: AMS 520.055.000
Nominal Diameter: 5.5 mm
Available Lengths: 25–80 mm
Length Increment: 5 mm
Number of Configurations: 12
Design: Threaded Screw with Polyaxial Reduction-Style Head
Fixation Concept: Posterior Screw-and-Rod Reduction / Stabilization Construct
Anatomical Application: Spine
Identification: Individual Cat. No. and GTIN No. for each length

Product Features

• Poly Axial Spondylolisthesis Reduction Screw Design.
• Manufactured from Titanium according to the catalog.
• Nominal diameter: 5.5 mm.
• Threaded shaft for vertebral bone engagement.
• Polyaxial proximal fixation head.
• Extended reduction-style head configuration.
• Designed for compatible posterior spinal fixation systems.
• Available in 12 length configurations.
• Length range from 25 to 80 mm.
• Regular 5 mm increments.
• Supports different fixation-depth requirements.
• Supports rod alignment within compatible system limits.
• Designed for integration with compatible rod and locking components.
• Individual Cat. No. for every screw length.
• Individual GTIN No. for every configuration.
• Supports implant identification, traceability, procurement, and inventory management.